Fluid-pressure mechanism.



Patented Dec. 31|, v190|.

No. www.

H. R. MASON.

FLUiD PRESSURE lllE0".|IIMIISI4L.`

(Application led May 8, 1901.) (lo Model.)

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HARRY R. MASON, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE VVESTING- HOUSE AIR BRAKE COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

FLUID-PRESSURE MECHANISIVI.

SPECIFICATION forming part of Letters Patent No. 689,897, dated December 31, 1901.

Application filed May 8, 1901.

To all whom it may concern.-

Beit known that 1, HARRY R. MASON, a citizen of the United States of America, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Fluid-Pressure Mechanism, (Case No. 4,) of which the following, taken in connection with the accompanying drawings, is a specication.

My present invention has for its object the provision of an improved form of iiuid-pressure mechanism in which a single controlling-valve is subjected to the operation of any one of a plurality of pressures at will, said controlling-valve being provided with a movable abutment and suitable means for loading said movable abutment in opposition to the force of the fluid-pressure.

Another object of my invention is the combination, with the controlling-valve, its movable abutment, and load device, of a reducing-valve device for causing the iiuid to act upon the movable abutment at a reduced pressure, and means for throwing said reducing-valve device into and out of operation at will,such means being illustrated in preferred form in connection with the other elements of my invention in the accompanying drawings, in which- Figure 1 is a vertical section through a device embodying my invention, and Fig. 2 is 4a horizontal section on the line 2 of Fig. 1.

Referring first more especially to Fig. 1, it will be seen that in carrying out my invention I provide a controlling-valve casing 3, having an inlet-opening'or connecting-tube 4 and an outlet-passage 5, communication between the inlet and outlet being primarily through the port 6, governed by the controlling-valve 7, which is held bya spring 8 and bolt 9 in a stem 10, which, together with the diaphragm 11, constitutes a movable abutment for the controlling-valve and is subject to pressure on a shoulder at its upper end from a spring 12, the tension whereof is adjusted by means of the nut 13. It will be observed that the pressure in the chamber beneath the diaphragm l1 does not enter directly from the inlet-tube 4, but comes through either one of the two passages 14 15, the lat- Serial No. 59,245. (No model.)

ter being under the control of a cock 16 and the former of a back-pressure or reducing valve 17, held to its seat by a spring 1S under the adjustable tension of a n ut 19. When the parts are in the position shown in the drawings, air from the inlet-tube 4 passes down through 15 and through the cock 16 into the chamber A, which is below the movable abutment that actuates the controlling-valve, the latter remaining closed until sufficient pressure is exerted to overcome the resistance of the spring 12,when the valve will open and permit pressure to How through and into the outlet-passage 5. So long as the cock 16 remains in the position shown air does not pass the back-pressure valve 17, since it has freer communication through the passage 15; but when the cock 16 is closed, so as to shut up the passage 15, then the air traverses the passage 14 and, acting against the back-pressure valve 17, overcomes the resistance of the spring 18 and reaches the chamber A through the passage 20 at a reduced pressure, the amount of the reduction depending upon the strength of the spring 18. Thus when the spring 12 is set at a predetermined point with the cock 16 open the controlling-valve will be actuated at a certain pressure-say seventy poundsin the inlet-passage 4, whereas if the cock 16 be closed the valve 7 will not open until the pressure is increased in the passage 4 to equal seventy pounds plus the resistance of the baclcpressure valve 17, which may be fixed at anything desired by the strength of the spring 18 and the adjustment of the nut 19, which is intended to operate at about twenty to thirty pounds, which would thus require an accumulation of from ninety to a hundred pounds in the inlet-opening 4 before the controlling-valve would be opened.

To allow the pressure between the controlling and reducing valves to escape when the reducing-valve closes,I provide a leakage-port 19a, which insures at all times a ready response to variations in the pressure of the inlet-pipe.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A fluid-pressure mechanism comprising loo reducing valve, substantially as described.

2. A Huid-pressure mechanism comprising a controlling Valve, a movable abutment therefor, a spring bearing against said movable abutment on one side, a fluid-pressure chamber upon the other side of said movable abutment in which the fluid-pressure acts in opposition to the spring, a fluid-inlet to said chamber, controlled by a manually-operated device and another Huid-pressure inlet to said chamber, provided with a pressure-reducing valve, substantially as described.

3. A fluid-pressure mechanism comprising a controlling valve, a movable abutment therefor, a spring bearing against said mov- 'able abutment on one side, a fluid-pressure chamber upon the other side of said movable abutment in which the fluid-pressure acts in opposition to the spring, a fluid-inlet to said `chamber controlled by a manually-operated device, another fluid-pressure inlet to said chamber, provided with a pressure-reducing valve, said pressure-reducing valve comprising a puppet-valve, a spring, and a device for adjustingthe tension of said puppet-valve spring, substantially as described.

4. A duid-pressure mechanism comprising a controlling-valve, a movable abutment therefor subject to yielding pressure in opposition to the uid-pressure, a fluid-pressure chamber on the side of the movable abutment opposite said yielding pressure, a passage leading to said Huid-pressure chamber, a re- (lacing-valve device in said passage, and means for rendering said reducing-valve device operative or inoperative at will, substantially as described.

5. A duid-pressure mechanism comprising a controlling-valve, a movable abutment therefor subject to yielding pressure in opposition to the duid-pressure, a Huid-pressure chamber on the side of the movable abutment opposite said yielding pressure, a passage leading to said Huid-pressure chamber, a reducing-valve device in said passage, means for rendering said reducing-valveidevice operative or inoperative at will and a leakageport for permitting the escape of pressure from between the controlling-valve and reducing-valve, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

HARRY R. MASON.-

Attest:

PAUL CARPENTER, H. W. SMALLEY. 

